I liked Option B better as I felt that it emphasized the lunar cycle better. Have you thought about reducing the moons slightly? I think the image might be stronger with a little more breathing room on the sides. Just a thought :)

I really like the contrast of the craters; I think keep them the way you have it. I think the trees at the bottom of the piece don't really add much to the overall idea though. I would maybe consider cropping just to the moon phases and making it a horizontal piece instead of vertical. Just something to consider!